1.
The point on the orbit of a celestial body that is farthest from the sun.
远日点在天体运行轨道上距离太阳最远的点
2.
periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun.
以太阳为中心的最近点；在天体运行轨道上距离太阳最近的点。
3.
apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun.
以太阳为中心的最远点；在天体运行轨道上距离太阳最远的点。
4.
The path of a celestial body or an artificial satellite as it revolves around another body.
运行轨道天体绕另一天体或人造卫星绕一天体旋转所运行的轨道
5.
bring about the capture of an elementary particle or celestial body and causing it enter a new orbit.
致使基本粒子或天体被俘获并使之进入新的运行轨道的发生。
6.
Both target and projectile orbit the primary.
无论靶体还是射体都在绕主天体作轨道运动。
7.
(astronomy) the point in as orbit closest to the body being orbited.
天文学中的离被绕行天体最近的轨道上的点。
8.
(astronomy) the point in an orbit farthest from the body being orbited.
天文学中的离被绕行天体最远的轨道上的点。
9.
Not running on tracks or rails.
无轨的不在轨道或铁轨上运行的
10.
By that time, the first one had been in orbit about eleven days.
而当时第一艘已经在轨道中运行了11天了，
11.
The space shuttle will orbit a weather satellite.
航天飞机将把一个气象卫星送入运行轨道。
12.
Planets roll on their courses.
行星在轨道上运行。
13.
The point nearest the sun in the orbit of a planet or other celestial body.
近日点绕日运行的行星或其它天体的椭圆轨道上离太阳最近的一点
14.
A satellite is an object, either natural or man-made, which travels in an orbit round another object in space.
卫星是一种天然的或人造的物体，在太空中按一定轨道围绕着另一物体运行。
15.
the (usually elliptical) path described by one celestial body in its revolution about another.
天体绕另一天体或人造卫星绕一天体旋转所运行的轨迹。
16.
People noticed long ago that these traveling bodies moved around in the sky in definite paths.
很久以前，人们就注意到，这些移动着的天体以固定的轨道绕太阳运行。
17.
Perhaps Pluto is only the first of many similar objects orbiting in the darkness far beyond the sun.
也许冥王星只是在离太阳很远的一片黑暗中沿轨道运行的许多类似天体中的第一个，
18.
One complete revolution of such a body.
轨道的一周此类天体或卫星的环行一周